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Issue #16562: Optimize dict equality testing.

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Patch by Serhiy Storchaka (reviewed by Martin and Raymond).
This commit is contained in:
Antoine Pitrou 2012-12-02 19:10:07 +01:00
parent 181e20a6fc
commit 0e9958b543
2 changed files with 8 additions and 1 deletions
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2
Misc/NEWS
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@ -10,6 +10,8 @@ What's New in Python 3.4.0 Alpha 1?
Core and Builtins
-----------------
- Issue #16562: Optimize dict equality testing. Patch by Serhiy Storchaka.
- Issue #16588: Silence unused-but-set warnings in Python/thread_pthread
- Issue #16592: stringlib_bytes_join doesn't raise MemoryError on allocation

7
Objects/dictobject.c
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@ -2114,13 +2114,18 @@ dict_equal(PyDictObject *a, PyDictObject *b)
if (aval != NULL) {
int cmp;
PyObject *bval;
PyObject **vaddr;
PyObject *key = ep->me_key;
/* temporarily bump aval's refcount to ensure it stays
alive until we're done with it */
Py_INCREF(aval);
/* ditto for key */
Py_INCREF(key);
bval = PyDict_GetItemWithError((PyObject *)b, key);
/* reuse the known hash value */
if ((b->ma_keys->dk_lookup)(b, key, ep->me_hash, &vaddr) == NULL)
bval = NULL;
else
bval = *vaddr;
Py_DECREF(key);
if (bval == NULL) {
Py_DECREF(aval);